Half to horace f



(No Model.)

L.-D. FARRA.

HEAT REGULATOR FOR FURNACES. No. 376,644. PateIitedJan. 1'7, 1888.

Fig.1.

WITNESSES: INVENTOR: $21M, 1 #9. 82AM) N. P152315. ahbwumo m u mmmm md, dc.

UNITED STATES- PATENT I OFFICE.

LORENZO D. FARRA, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF ONE- HALF TO HORACE F. MOGANN, OF SAME PLACE.

H EAT-REGULATOR FOR FURNACES.

srncIPIcA'rIoN forming part of Letters Patent No. 376.6 dated January 1 Applicution filed February 3, 1887. Serial No. 226,440. (No model.)

To 01. whom it may concern-.-

Be it known that I, LORENZO D. FARRA, a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Improvement in Heat-Regulators for Stoves or Furnaces,which improvement is fully set forth in the'followiug specification and accompanying drawings, in which-- Figure 1 represents a partial side elevation and partial vertical section of a heat-regulator for furnaces embodying my invention. Fig. 2 represents a top or plan view of a portion thereof. Fig. 3. represents, a vertical section of a portion thereof. Fig. 4. represents a side elevation of a modification. Fig. 5 represents a longitudinal section of another modification thereof.

Similar letters of reference-indicate corresponding parts in the several figures.

. My invention consists of improvements in heat-regulators for stoves or furnaces, as will be hereinafter fully set forth.

Referring to the drawings, A represents a stove or furnace of ordinary construction, and B represents a casing for the same.

O G represent two metallic tubes, preferably made of brass, which are secured at bottom to the base of the casing B and at top to the ends of a lever, D, it being noticed that the tubes extend vertically and parallel, one of the tubes being within the casing B and the other outside of the same.

E represents a lever, which is mounted on a bracket or bearing, F, secured to the casing B, or a hanger, which may be secured to the ceiling or a joist or beam overhead. (See dotted lines, Fig. 1.) To the short arm of the lever E is attached a link, G, with which is connected the lever D. The long arm of the lever has connected with it arod, H, which passes freely through the lever and has its upper end threaded for the attachment of a threaded nut, J, between which and the rod is a coiled spring, K, which encircles the rod and bears-against the lever and nut. The lower end of the rod H is connected with a lever, L, which is connected with a rock-shaft, M, the latter being mounted on a stove-pipe, as in Figs. 1 and 2, adjacent to the air-inlet N in said pipe. To the shaft M is secured the damper or valve P,which is adapted to cover and uncover said inlet N. In the long arm of the lever L are openings for the attachment of a weight, Q, whereby the damper or valve P may be balanced or adjusted.

In Fig. 4 the air-inlet N is shown as employed with the stove below the grate thereof for regulating the admission of air to the latter.

In Fig. 5 the rod H is shown as connected with a welllznown check-damper within a stove-pipe.

The tube 0 is exposed to the atmosphere outside of the building by means of a pipe, R, which leads fromthe atmosphere through a wall, window, 810., and directs air against the tube 0, said air descending, and thus subjecting said tubev to the action thereof..

In Fig. 3 the tube 0 is inclosed by a tube, 0 the latter being. connected with the air-inlet pipe R, whereby said tube '0 is subjected to the atmosphere, the air leaving the tube 0 at or near the bottom thereof;

In lieu of the tubes O O, I may use rods, which are, however, not as sensitive as tubes.

The tube 0, being firmly attached at one end to the base of the casing and at the other end to one arm of the lever D, forms a fixed connection for said lever D. Now, as the tube 0 is within-the casing B,it expands and contracts, due to the variations of the temperature within said casing,whereby, owing to the lever D and link G, the long arm of the lever is either lowered or raised, the effect of which is to open or close the damperP and control the volume of air admitted to the stove-pipe, as in Figs. 1 and 2, or into the stove below the grate, as in Fig. 4, or to open or close the damper within the pipe, as in Fig. 5. By these means, should the fire become low or high, it will be restored to its proper condition, and thus maintained approximately equable.

\Vhen the damper closes, should there be excessive upward strain on the long arm of the lever E, the spring K yields, and said arm is accordingly relieved and the parts prevented from being injured.

If desired, the dampers shown in Figs. 1, 2, and i may be connected with the lever E, both for adjusting the volume of air admitted into the stove-pipe and into the stove below the grate; and, if desired, a damper may be connected with a pipe secured to the stove above the fire, the result in this case being similar to that produced by the connection of the damper with the stove-pipe, Figs. 1 and 2.

Vhile the tube is subjected to variations of the atmosphere the extent of expansion and contraction of the same is less than that of the tube 0, so that said tube G provides a corn paratively fixed connection or pivot for the leverD and permit said lever to be controlled in the main by the expansion and contraction of the tube C.

I am aware that it is common in automatic dampers to construct the actuating mechanism of rods and levers so arranged as to be operated by the expansion or contraction of a casing secured to a stove; but I am not aware that the peculiar construction set forth and claimed has ever before been used, except by me, as herein described, the said construction making a device simple in character, efficient in operation, and one not easily liable to displacement of parts.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A heat-regulator for a stove or furnace, consisting of two tubes secured to the base of the casing of a stove, one only of said tubes being within the casing, the lever D, connecting the upper ends of said tubes, a lever pivoted to a frame above said casing and having its shorter arm connected by a link to said ver D, the rod H, having a screw-threaded end, the nut J, and the spring K, the pivoted lever L, the rock-shaft M, with damper P, the weight Q, and a pipe having opening N, all of said parts being combined substantially as described.

2. An automatic regulator for a stove or furnace, consisting of a damper, a series of connecting-levers attached to said damper, a tube having an air-inlet pipe and forming a fulcrum for one of said connecting-levers, and a tube actuating said fulcrumed lever, sub stantially as described.

3. An automatic regulator for'a stove or furnace, consisting of the tubes O and O, the said tubes being secured to the base of the easing B, and the tubeG being provided with the air-supply pipe R, the lever D, pivoted to said tubes 0 and O, the link G, the lever 16, having its fulcrum above said casing, the rod H, passing through one end of said lever D, and having the adjustable spring K thereon, the weighted lever L, the rock-shaft M, with damper I, and the pipe with opening LT, all substantially as described.

- LORENZO D. FARRA.

Vitnesses:

J on): A. WInDERsIInIM, A. P. Gainer. 

